Details
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Type:
Sub-task
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Status: Resolved
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: QuorumJournalManager (HDFS-3077)
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Fix Version/s: QuorumJournalManager (HDFS-3077)
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Component/s: None
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Labels:None
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Target Version/s:
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Hadoop Flags:Reviewed
Description
In order for QJM to work with HA, the standby needs to be able to read from a JournalNode even when no active has written to it. In the current code, it reads the StorageInfo only when newEpoch() is called. But, that's only called when a writer becomes active. This causes the SBN to fail at startup since the JN thinks its storage info is uninitialized.